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Recent advances in single-atom insertions into heterocycles. a, Representative azole-carbon insertion reaction75 (top), and applications of a related insertion reaction in the synthesis of complanadine A77 (bottom). b, Ether–boron insertion reactions78. The inserted atoms are circled, and the expanded rings are highlighted in red for clarity. Boc, tert-butoxycarbonyl group; Pin, pinacol; Mes, mesityl group.
